Historically, homes were built with significant air leakage, allowing natural ventilation that helped dilute indoor pollutants from sources like wood fires and gas lamps. Research indicates that homes built before the 1970s had air change rates of 5–10 ACH (air changes per hour), compared to modern standards that aim for 2 ACH or lower. This natural airflow, while inefficient in terms of energy use, played a crucial role in maintaining indoor air quality and occupant health. Studies from institutions like Lawrence Berkeley National Laboratory and Imam Abdulrahman Bin Faisal University highlight the health benefits of such ventilation methods, showing reductions in airborne virus transmission by up to 80% in traditional buildings. However, the energy crisis of the 1970s shifted focus towards airtight construction, which can lead to indoor air quality issues if not paired with adequate ventilation systems. Modern standards, such as ASHRAE 62.2, emphasize the importance of balancing airtightness with proper ventilation to ensure healthy indoor environments. The evolution of housing design suggests a need for a middle ground, combining energy efficiency with effective ventilation strategies to create healthier homes.